If players would like to use different / other miniatures for variety, I think that is fine. For the Americans, they have one naval bomber unit representing all of their different types of naval attack aircraft. For the British, the Swordfish unit represents their naval bombers (including the barracuda). We could introduce a late war British naval tactical bomber. Would the values be very different from the swordfish unit?
I typically see the British put Typhoon units on their carriers late in the war. While typhoons were not on carriers, the unit represents a good mix of air-to-air value and naval combat value (therefore representing a half group of corsairs and a half group of barracudas for example).
The challenge of introducing more units is that the spaces get increasingly crowded with many different types of unique units.